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Grid chess
Grid chess is a chess variant invented by Walter Stead in 1953. It is played on a ''grid board''. This is a normal 64-square chessboard with a grid of lines further dividing it into larger squares. A single rule governs Grid chess: for a move to be legal, the piece moved must cross at least one grid line.
Grid chess is also used in chess problems.
==Description==
Various arrangements of the grid have been tried, but the original, and by far the most popular, is that shown to the right, which divides the board into sixteen 2×2 squares.
In the sample position, White can play either a3 or a4, but cannot move his b-pawn. Black cannot play Bd5 but can play any other bishop move – if he wants to put his bishop on d5, it will take two moves (for example, first Ba8, then Bd5). The white king is not in check from the queen, but would be, if the queen were to take a step back with Qe3. The white king cannot take the queen, although the white knight can. The black king, on the other hand, ''is'' in check from the rook on c8. Black cannot escape check as he could in standard chess with Ke7 or Kf7, as these moves do not cross a grid-line. He can play Kd7, however, and also Kd8, bringing the king into the same large square as the rook.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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